CATDOLL : CATDOLL: Things to note about green shrimp

Notes on green shrimp

1. Shrimp is rich in nutrients, and its meat is soft and easy to digest. It is an excellent food for people who are weak or need to recuperate after illness; 2. Shrimp is rich in magnesium, which plays an important role in regulating heart activity and can protect the cardiovascular system. It can reduce the cholesterol content in the blood, prevent arteriosclerosis, and dilate the coronary artery, which is beneficial for preventing hypertension and myocardial infarction;

⒊ Shrimp has a strong lactation effect and is rich in phosphorus and calcium, which is especially beneficial for children and pregnant women;

⒋ Scientists at Osaka University in Japan have found that astaxanthin in shrimp can help eliminate the "jet lag" caused by jet lag. ⒈ Suitable for people with kidney deficiency, impotence, male infertility, and weak waist and legs; suitable for middle-aged and elderly people with calf cramps caused by calcium deficiency; more suitable for middle-aged and elderly people, pregnant women and patients with cardiovascular diseases;

⒉ People with chronic diseases or those who are suffering from internal heat should not eat shrimps; people with allergic rhinitis, bronchitis, and recurrent allergic dermatitis should not eat shrimps; shrimps are wind-inducing food, so people with skin scabies should avoid eating them. ⒈ Shrimp can be cooked by frying, stewing, brine, oil-frying, and stir-frying. It can also be processed into lake rice;

⒉ If shrimps are red, soft, and drooping and are not fresh, try not to eat them. Do not eat rotten or spoiled shrimps. The shrimp thread on the back of the shrimp should be picked out and not eaten.

Dietary effects

Shrimp is warm in nature and sweet in taste, and enters the liver and kidney meridians;

It has the effects of nourishing the kidney and strengthening yang, promoting lactation and resisting toxins, nourishing blood and consolidating essence, removing blood stasis and detoxifying, invigorating qi and nourishing yang, unblocking meridians and relieving pain, and stimulating appetite and resolving phlegm.

It is suitable for patients with kidney deficiency, impotence, sperm production and marrow supplement, premature ejaculation, milk blockage, muscle and bone pain, hand and foot cramps, itching all over the body, skin ulcers, physical weakness and neurasthenia. When buying shrimps, choose shrimps with complete bodies, dense shells, clear and bright shells, firm muscles, elastic bodies, and dry and clean body surfaces. As for shrimps with loose meat, reddish color, and fishy smell, they are not fresh enough and should not be eaten. Generally speaking, shrimps with a tight connection between the head and the body are relatively fresh.

Why do freshwater shrimps need to molt as they grow? What are their characteristics?

Green shrimps are crustaceans, and their surface is covered with a translucent chitin exoskeleton, which is very hard and plays a supporting role in protecting the internal organs and attached muscles. Once the shell hardens, it cannot increase with the growth of the body, so the growth of green shrimps must be completed by molting, and their growth is achieved before the new shell hardens, so molting is an important sign of green shrimp growth. Green shrimps molt about 20 times in their lifetime. Generally, they molt once every 1 to 3 days during their larval metamorphosis stage, and enter the juvenile shrimp (larvae) stage after about 9 molts. In the juvenile shrimp stage, they molt once every 7 to 11 days, and in the adult shrimp stage, they molt once every 15 to 20 days. The body of the newly molted green shrimp is extremely soft, with weak mobility and no ability to resist enemies. It is easy to be killed and eaten by the same species or other carnivorous animals, so the molted shrimps are often hidden in hidden places. Green shrimps that enter the wintering period no longer molt and stop growing.

The growth molt of shrimp can be divided into four types: metamorphosis molt, growth molt, regeneration molt and reproductive molt.

(1) Metamorphosis

During this period, the molt occurs about 9 times. During this period, each molt not only increases the length and weight of the body, but also undergoes significant changes in morphology and structure. (2) Growth Molt

Molting occurs when shrimps grow from juveniles to adults. The morphology of the molt does not change during this stage, but the body length and weight increase significantly. Juvenile shrimps grow fast and have a short molting interval, molting once every 7 to 14 days; adult shrimps need 15 to 20 days to molt once. The length of the molting interval is closely related to the ecological environment. When the water temperature is high, the bait is abundant, there is a lot of animal bait, and the water quality is suitable, shrimps grow fast and the molting frequency is high; otherwise, the frequency is low. The mortality rate of molting in freshwater shrimps after wintering is high because after 4 to 5 months of dormancy and a long period of no food, the shrimps are weak, the shells are hard, and dirt is attached, which often leads to unsuccessful molting and death. (3) Regenerative molting

When a prawn's appendage is damaged, it can regenerate after molting. However, the new limb is smaller than the original one, and there is no significant increase in body length and weight before and after molting. (4) Reproductive molting

A molt performed by sexually mature female shrimp before mating. Reproductive molting is limited to females, and males do not molt before mating. During reproductive molting, the body length and weight of female shrimp will not increase, but some morphological changes will occur before and after molting, mainly the appearance of longer bristles at the base of the abdominal limbs for the attachment of eggs.

Shrimp can molt at any time of the day or night, but more often at dusk and before dawn. They do not eat before molting, and do not eat for a day after molting because their jaws are not yet hard. They gradually resume eating after their limbs become strong.

The shrimp is a crustacean, with a translucent chitinous exoskeleton on its body surface, which is very hard and protects the internal organs and attached muscles. Once the shell hardens, it cannot increase with the growth of the body, so the growth of the shrimp must be completed by molting, and its growth is achieved before the new shell hardens, so molting is an important sign of the growth of the shrimp.

Shrimp molts about 20 times in their lifetime. Generally, they molt once every 1 to 3 days during the metamorphosis stage of their larvae, and enter the juvenile shrimp (post-larvae) stage after about 9 molts. During the juvenile shrimp stage, they molt once every 7 to 11 days, and during the adult shrimp stage, they molt once every 15 to 20 days. The bodies of newly molted shrimp are extremely soft, with weak mobility and no ability to resist enemies. They are easily killed and eaten by their own kind or other carnivorous animals, so molted shrimp often hide in hidden places. Shrimp that enter the wintering period no longer molt and stop growing. The growth molts of shrimp can be divided into four types: metamorphosis molt, growth molt, regeneration molt and reproductive molt.

(1) Metamorphosis Molting from larvae to shrimp larvae requires about 9 molts. During this stage, each molt not only increases the length and weight of the shrimp, but also causes significant changes in its morphological structure.

(2) Growth molting Molting occurs from juvenile shrimp to adult shrimp. During this stage, the molting morphology does not change, but the body length and weight increase significantly. Juvenile shrimp grow fast and the molting interval is short, molting once every 7 to 14 days; adult shrimp need 15 to 20 days to molt once. The length of the molting interval is closely related to the ecological environment. When the water temperature is high, the bait is abundant, there is a lot of animal bait, and the water quality is suitable, the shrimp grows fast and the molting frequency is high; otherwise, it is low. The mortality rate of molting in freshwater shrimp after wintering is high because after 4 to 5 months of dormancy and no food for a long time, the shrimp body is weak, the shell is hard, and dirt is attached, which often leads to unsuccessful molting and death.

(3) Regeneration When the limbs of a shrimp are damaged, they can regenerate after molting. However, the new limbs are smaller than the original ones, and there is no significant increase in body length and weight before and after molting.

(4) Reproductive molt: A molt that occurs before mating in sexually mature female shrimp. Reproductive molt occurs only in females; males do not molt before mating. Female shrimps will not increase in length or weight during reproductive molt, but some morphological changes will occur before and after molt, mainly the appearance of longer bristles at the base of the abdominal limbs for the attachment of eggs. Shrimp can molt during the day or night, but more often at dusk and before dawn. They will not eat before molting, and will not eat for a day after molting because their jaw teeth are not yet hard. They will gradually resume eating after their limbs become strong.

This article is from: China Agricultural Press "Animal Welfare and Meat Production"